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Nano-Sized Lithium Manganese Phosphate/Carbon Nanotube Composites with Enhanced Electrochemical Activity for Lithium-Ion Batteries

Published online by Cambridge University Press:  20 July 2012

Satoru Tsumeda ,
Scott D. Korlann ,
Shunzo Suematsu  and
Kenji Tamamitsu
Satoru Tsumeda
Affiliation:
United Chemi-Con, Inc. (Nippon Chemi-Con Corp. Group), 625 Columbia Street, Brea, CA 92821, U.S.A.
Scott D. Korlann
Affiliation:
United Chemi-Con, Inc. (Nippon Chemi-Con Corp. Group), 625 Columbia Street, Brea, CA 92821, U.S.A.
Shunzo Suematsu
Affiliation:
United Chemi-Con, Inc. (Nippon Chemi-Con Corp. Group), 625 Columbia Street, Brea, CA 92821, U.S.A.
Kenji Tamamitsu
Affiliation:
Nippon Chemi-Con Corporation, 363 Arakawa, Takahagi, Ibaraki 318-8505, Japan
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Abstract

Olivine lithium manganese phosphate, LiMnPO4 is a promising cathode material for high energy and safe lithium ion batteries. However, LiMnPO4 possesses excessively poor electrochemical activity, compared to conventional cathode materials. To enhance the electrochemical activity, we have synthesized LiMnPO4/multi-walled carbon nanotube (MWCNT) composites by employing an in-situ sol-gel method. The LiMnPO4/MWCNT composites were investigated by utilizing X-ray diffraction, thermogravimetric analysis, scanning electron microscope, transmission electron microscope, and galvanostatic charge-discharge cycling. The LiMnPO4 showed a particle size of ca. 50 nm and capacity of 102 mAh/g at 0.1 C without C.V. charging mode. This study demonstrated that the electrochemical activity of LiMnPO4 was significantly affected by not only pH and the amount of a chelating agent but also unreacted Mn2+. This is the first report analyzing the existence and effects of unreacted Mn2+ in LiMnPO4 synthesized by a sol-gel method.

Keywords

energy storagenanostructuresol-gel
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1440: Symposium O – Next-Generation Energy Storage Materials and Systems , 2012 , mrss12-1440-o09-125
Copyright
Copyright © Materials Research Society 2012

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References

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